I have a debian comp in my network which I want to use as a mail server.
So that anybody with a vaild account could write emails and the server would
directly send them out to their destination. The server should also recieve all incoming emails for a specific domain and should let any user on the network or from the outside download the messages (maybe even store them...).

Should I use Courier, can it do everything?
Can courier recieve emails and let Mozilla etc. retrieve them?
Do I need other programs such as Qmail to send the messages (as an SMTP server?)
Should I use something like Squirrelmail as a web interface or is
the one in Courier good enough?
One last question is setting up IMAP worth it (instead of Pop?)

It would be nice if someone could give me some advice here, and tell me what to use, maybe even show me a good Howto or guide for what I want to do.

Thanx, WCprof

squirrelmail is very nice, here, i use postfix+squirrelmail+uw-imap(becuase of mbox support, think courier-imap support .maildir or something)+apache, php, and all that.

also, the postfix configs are very well documented and also found good documentation online for it.

From what I see on their website, courier can do it all. You should be able to retreive your mail from mozilla or pop/imap.

You can use squirrelmail if you want, but it is more ressource-hungry. You can have both running at the same time. Squirrelmail is available from everywhere, without the need to configure a client.

You'll like imap, for sure.

Be careful, some ISP's block port 25 and 80

thanks then I guess I'll just stick with Courier and IMAP